The Nus hydroelectric power plant uses, for the production of fully renewable hydropower, the waters of the Saint-Barthélemy valley, captured at high altitude with different intakes on the Saint-Barthélemy, Chaléby and Comba d’Eche streams.

Water power is then conveyed - through 4 km of canal - to the Torre reservoir, named for the existence nearby of a medieval signal tower. The Nus power plant was built in 1951. In 2012 it underwent an intervention that allowed the installation of a new hydroelectric unit, equipped with a Pelton turbine capable of delivering 7.5 MW of power.

In the summer period, the plant has very little production because the water is mainly used (through a diversion on the penstock) for sprinkler irrigation of the surrounding land. The Nus plant, which originally fed energy onto the 132 kV grid with its own transformation, now uses the electrical station and transformer of the nearby Quart plant, which is connected to the national 220 kV grid.

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